<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .p1{
            color:red;
        }
    </style>
</head>
<body>
    <div id="root"></div>
    <script crossorigin src="https://unpkg.com/react@17/umd/react.development.js"></script>
    <script crossorigin src="https://unpkg.com/react-dom@17/umd/react-dom.development.js"></script>
    <script src="https://unpkg.com/babel-standalone@6/babel.min.js"></script>
    <script type="text/babel">
        let H1Element = function(props){
            let style = {color:"red",backgroundColor:"yellow"};
            return <h1 style={style} title={props.myTitle}>{props.children}</h1>
        }
        let PElement = function(props){
            // 单行
            let content = "段落1";
            /* 
                多行注释
            */
            let className = "p1";
            return <div>
                {/* 注释 */}
                <label htmlFor="d1">内容</label>
                <p id="d1" className={className}>{props.children}</p>
            </div>
            
        }
        let RootElement = function(){
            let ary = ["段落1","段落2","段落3"];
            return (
                <div>
                    <H1Element myTitle="标题1">标题内容1</H1Element>
                    <H1Element myTitle="标题2"></H1Element>
                    {ary.map((ele) => <PElement>{ele}</PElement>)}
                </div>
            )
        }
        ReactDOM.render(<RootElement />,document.getElementById("root"));
    </script>
</body>
</html>